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什么叫颗粒群最小沉降速度U0?它与沉淀池表面负荷率有怎样的关系?例:某城市污水厂初沉池设计中,测得U0=0.42mm/s,求初沉池表面负荷率;若处理量是8万m3/d则需沉淀池有效面积为多少?(9分)

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